Cylinder-lapping tool



W. A. SALTER.

CYLINDER LAPPING TOOL.

APPLICATION HLED NOV. 2. 1920.

1,398,398, Patented Nov; 29, 1921.

FIG. 51

WITNESSES: IN VEN TDR UNITED STATES PATENT OFFICE.

CYLINDER-LAIPING TOOL.

Specification of Letters Patent.

Patented Nov. 29, 1921.

Application filed November 2, 1920. Serial No. 421,355.

T0 all wl0m t may concern:

Be it known that I, WILLIAM A. SALTER, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements of Cylinder-Lapping Tools, of which the following is a specification.

My invention relates to a tool, for the truing up of the holes in automobiles and other small engine cylinders after they have been worn by use, without the use of expensive boring or grinding machinery, by providing a tool that is cheap to manufacture, and can be used anywhere for this purpose by anyone.

To attain this end generally speaking, my invention consists of a metallic collar, split on one side and adjustable as to size eX- pansively, and attached to an operative handle for the use of the person working it; be ing adjustable as to size to fit the cylinder to be worked upon, an abrasive compound is applied to the outside of this lapping tool, and the working of it in a rotative and vertical movements in the cylinder walls, gradually laps out the material in the cylinder walls until the bore is round and true.

In the accompanying drawings, I have represented a lapping tool, embodying all of my improvements in the way best known to me, as is necessary to illustrate the subject matter claimed;

Figure 1 is a central end sectional view of the tool.

Fig. 2 is a central side sectional view, showing the tool, and the expansion bolt.

Fig. 3 is a vertical sectional view of the lapping tool attached to an operative handle, and inserted in a cylinder bore for use.

In the practice of my invention, I provide a metallic collar A, split on one side, and having the bosses A A that are bored for receiving the handle pin E, and also having the expansion lugs A A with a tapered groove B in each, in which grooves works the tapered bolt C connected with the nut C, for expanding the lapping tool in its work.

The operative handle D is preferably of a T shape and has a hole at its lower end through which passes the pin E, flexibly atta ching it to the lapping tool A.

Cotter pins are passed through the holes e h P n E, te ke p h% P i pressed against the smallest section of the Y cylinder hole, and a circular and vertical movement given to the tool, thus cutting or lapplng out the cylinder walls by means of the abrasive compound between the cylinder wall and the lapping tool. Further expansion is given the lapping tool by the ex panding bolt C, until the entire cylinder hole is worked out to its largest size and the hole true and round.

Grooves H, are cut in the outside of the lapping tool for the purpose of carrying a supply of the abrasive lapping compound, and facilitating the work.

An eccentric formed collar, slotted at its thinnest section, gives the most uniformly circular shape under expansions, and is preferable.

I claim as my invention and desire to secure by Letters Patent l. In a cylinder lapping tool, the combination of a metallic collar, with compression tension, split on one side throughout its length, internal flexible means for attaching the collar to an operative handle, and adjustable non-yielding means for expanding the collar.

2. In a cylinder lapping tool, the combination of a metallic collar with compression tension slotted on one side throughout its length, two bosses near the center of collar and at right angles from the slot, holes in the bosses, and non-yielding internal adjustable means for expanding the collar.

3. In a cylinder lapping tool, the combination of a metallic collar with compression tension longitudinally slotted on one side throughout its length, and having a pair of internal lugs, one on either side of the slot in collar, and rigid adjustable means for spreading the lugs, for the purpose described.

4. In a cylinder lapping tool, the combina tion of a metallic collar having compression tension longitudinally slotted on one side, 'an internal lug on either side of the slot and having longitudinal t pere g oov each other, a tapered bolt with a nut at its threaded end engaging with the tapered grooves, and internal means for attziching the collar to an operative handle.

5. In a cylinder lappin g tool, the combination of a metallic collar with compression tension lingitudinally slotted on one side, bosses near the center of the collar and at right angles to the slot, holes in the bosses, two internal lugs one on either side of the slot and having longitudinal tapefed grooves facing each other, a tapered bolt and nut engaging with the tapered grooves, and means for adjusting the bolt, for the purpose described.

6. In a cylinder lapping tool, the combination of a -metallic slit collar having an eccen trio sectional form with the slot in the thinnest section thereof, flexible means for at taching the collar to an operative handle, and rigid means for expanding the collar.

7. In a cylinder lapping tool, the combination of a metallic split collar having an eccentric form and slotted in its thinnest section, two bosses near center of collar and at right angles to the slot, holes in the bosses, a lug on either side of the slot and having tapered grooves facing each other, and a tape red bolt with a nut at its upper end, engag1ng with the tapered grooves.

8. In a cylinder lapping tool, the combina' tion of a metallic collar, with compression tension, split on one side throughout its length, internal means for attaching the collar to an operative handle, rigid means for .expanding the collar, and grooves cut in outform, but with a short section at either end concentric in form slit on one side longitudinally throughout its length, internal means forattaching an operative handle, and positive means for spreading the slot.

In testimony whereof I have signed my name to this .specification in the presence of two s1ibscribing witnesses.

, WILLIAM A. SALTER.

Witnesses:

M. A. SALIER, R. L. PAYTON. 

